21720645

素因数分解:

$3^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{28393}}^1$

素因数の和:28421

約数の個数: 24

約数和(自身を含む): 39865176

約数和(自身を除く): 18144531

約数列:

[1, 3, 5, 9, 15, 17, 45, 51, 85, 153, 255, 765, 28393, 85179, 141965, 255537, 425895, 482681, 1277685, 1448043, 2413405, 4344129, 7240215, 21720645]

約数ペア:

[(1, 21720645), (3, 7240215), (5, 4344129), (9, 2413405), (15, 1448043), (17, 1277685), (45, 482681), (51, 425895), (85, 255537), (153, 141965), (255, 85179), (765, 28393)]